Dinisauria is a very diverse group indeed. Most dinosaurs showed little resemblance at all to birds except the bi-pedal ones, for which there is considerable resemblence.
Look at the corythisaurus at right for an example of a non-therapod, but still quite bird-like dinosaur. This animal is similar to the creatures in the picture above in the herd drinking from the pond.
The other animals pictured above are sauropods, dinosaurs which diverged from therapods almost as soon as dinosauria began. The sauropods are the largest land animals that have ever lived. And the biggest among them is seismosaurus, reconstructed here at 137 feet long!
Yes those are people standing under it, looking like grass!